The Ruby OCR SDK supports the Carte Nationale d'Identité API.

Using the sample below, we are going to illustrate how to extract the data that we want using the OCR SDK.

Quick-Start

require 'mindee'

# Init a new client
mindee_client = Mindee::Client.new(api_key: 'my-api-key')

# Load a file from disk
input_source = mindee_client.source_from_path('/path/to/the/file.ext')

# Parse the file
result = mindee_client.parse(
  input_source,
  Mindee::Product::FR::IdCard::IdCardV2
)

# Print a full summary of the parsed data in RST format
puts result.document

# Print the document-level parsed data
# puts result.document.inference.prediction

Output (RST):

########
Document
########
:Mindee ID: d33828f1-ef7e-4984-b9df-a2bfaa38a78d
:Filename: default_sample.jpg

Inference
#########
:Product: mindee/idcard_fr v2.0
:Rotation applied: Yes

Prediction
==========
:Nationality:
:Card Access Number: 175775H55790
:Document Number:
:Given Name(s): Victor
                Marie
:Surname: DAMBARD
:Alternate Name:
:Date of Birth: 1994-04-24
:Place of Birth: LYON 4E ARRONDISSEM
:Gender: M
:Expiry Date: 2030-04-02
:Mrz Line 1: IDFRADAMBARD<<<<<<<<<<<<<<<<<<075025
:Mrz Line 2: 170775H557903VICTOR<<MARIE<9404246M5
:Mrz Line 3:
:Date of Issue: 2015-04-03
:Issuing Authority: SOUS-PREFECTURE DE BELLE (02)

Page Predictions
================

Page 0
------
:Document Type: OLD
:Document Sides: RECTO & VERSO
:Nationality:
:Card Access Number: 175775H55790
:Document Number:
:Given Name(s): Victor
                Marie
:Surname: DAMBARD
:Alternate Name:
:Date of Birth: 1994-04-24
:Place of Birth: LYON 4E ARRONDISSEM
:Gender: M
:Expiry Date: 2030-04-02
:Mrz Line 1: IDFRADAMBARD<<<<<<<<<<<<<<<<<<075025
:Mrz Line 2: 170775H557903VICTOR<<MARIE<9404246M5
:Mrz Line 3:
:Date of Issue: 2015-04-03
:Issuing Authority: SOUS-PREFECTURE DE BELLE (02)

Field Types

Standard Fields

These fields are generic and used in several products.

Basic Field

Each prediction object contains a set of fields that inherit from the generic Field class.
A typical Field object will have the following attributes:

• value (String, Float, Integer, Boolean): corresponds to the field value. Can be nil if no value was extracted.
• confidence (Float, nil): the confidence score of the field prediction.
• bounding_box (Mindee::Geometry::Quadrilateral, nil): contains exactly 4 relative vertices (points) coordinates of a right rectangle containing the field in the document.
• polygon (Mindee::Geometry::Polygon, nil): contains the relative vertices coordinates (Point) of a polygon containing the field in the image.
• page_id (Integer, nil): the ID of the page, is nil when at document-level.
• reconstructed (Boolean): indicates whether an object was reconstructed (not extracted as the API gave it).

Aside from the previous attributes, all basic fields have access to a to_s method that can be used to print their value as a string.

Classification Field

The classification field ClassificationField does not implement all the basic Field attributes. It only implements value, confidence and page_id.

Note: a classification field's value is always a String`.

Date Field

Aside from the basic Field attributes, the date field DateField also implements the following:

• date_object (Date): an accessible representation of the value as a JavaScript object.

String Field

The text field StringField only has one constraint: it's value is a String (or nil).

Page-Level Fields

Some fields are constrained to the page level, and so will not be retrievable to through the document.

Attributes

The following fields are extracted for Carte Nationale d'Identité V2:

Alternate Name

alternate_name (StringField): The alternate name of the card holder.

puts result.document.inference.prediction.alternate_name.value

Issuing Authority

authority (StringField): The name of the issuing authority.

puts result.document.inference.prediction.authority.value

Date of Birth

birth_date (DateField): The date of birth of the card holder.

puts result.document.inference.prediction.birth_date.value

Place of Birth

birth_place (StringField): The place of birth of the card holder.

puts result.document.inference.prediction.birth_place.value

Card Access Number

card_access_number (StringField): The card access number (CAN).

puts result.document.inference.prediction.card_access_number.value

Document Number

document_number (StringField): The document number.

puts result.document.inference.prediction.document_number.value

Document Sides

📄document_side (ClassificationField): The sides of the document which are visible.

for document_side_elem in result.document.document_side do
  puts document_side_elem.value
end

Document Type

📄document_type (ClassificationField): The document type or format.

for document_type_elem in result.document.document_type do
  puts document_type_elem.value
end

Expiry Date

expiry_date (DateField): The expiry date of the identification card.

puts result.document.inference.prediction.expiry_date.value

Gender

gender (StringField): The gender of the card holder.

puts result.document.inference.prediction.gender.value

Given Name(s)

given_names (Array<StringField>): The given name(s) of the card holder.

for given_names_elem in result.document.inference.prediction.given_names do
  puts given_names_elem.value
end

Date of Issue

issue_date (DateField): The date of issue of the identification card.

puts result.document.inference.prediction.issue_date.value

Mrz Line 1

mrz1 (StringField): The Machine Readable Zone, first line.

puts result.document.inference.prediction.mrz1.value

Mrz Line 2

mrz2 (StringField): The Machine Readable Zone, second line.

puts result.document.inference.prediction.mrz2.value

Mrz Line 3

mrz3 (StringField): The Machine Readable Zone, third line.

puts result.document.inference.prediction.mrz3.value

Nationality

nationality (StringField): The nationality of the card holder.

puts result.document.inference.prediction.nationality.value

Surname

surname (StringField): The surname of the card holder.

puts result.document.inference.prediction.surname.value

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